Preventing Electrical Fires
Inadequate electrical capacity is mainly due to increasing the number of
devices that consume electricity in your home like new heating and cooling
equipment, frost free refrigerators, clothes dryers, water heaters, electric
ranges and ovens, dishwashers, and other powerful electric motor driven tools
and appliances.
As you add devices to your home, the power supply may become inadequate. If you
have indicators like fuses or circuit breakers tripping, or lights dimming, it’s
time to carefully look at your circumstances before equipment failure, fire, or
other problems arise.
5 Causes of Inadequate Power in Your Home
1.Limited service panel capacity
When the overall demand from total electrical devices is greater than what the
panel is able to supply, the main service panel will likely fail, frequently.
Excess demand indicates that the panel rating is less than needed or the panel
might be limiting capacity because it has no space left for more fuses or
circuit breakers.
In either case it’s time to make a circuit map to calculate demand and compare
it with the capacity of the main panel to supply. If you find the power demand
is less than the capacity and there is no room for more breakers, then a
sub-panel might be the answer. Conversely, if the overall demand is greater than
the main panel ability to supply, then you will need a licensed electrician to
install a new main panel.
2. Overloaded circuits
Another use for the circuit map is to determine if demand on the circuits are
greater than the amperage rating of the circuit controlling it. It is important
to note peak demands of appliances that may draw more power on starting and
create a power surge that trips the breaker.
A power surge that doesn’t trip the breaker is indicated by lights dimming when
an appliance turns on. Appliances that produce surges should have their own
separate circuit designed to tolerate the surge.
To prevent the risk of fire do not exceed the safe amperage of the circuit.
Blown fuses or tripped breakers indicate an overloaded circuit. Do not replace
breakers with ones of higher amperage just because they fail. Instead run a new
circuit from the main panel that is within the supply capacity.
3. Insufficient number of outlets
A general recommendation is to have at least one outlet for every 12 feet of
wall, ground fault interrupted outlets in bathrooms and exterior walls, one
outlet for each counter top in the kitchen, or as required by local codes.
The most obvious indicator that more outlets are needed is when you start to use
multi-outlet extension cords on a regular or permanent basis. Most low cost
extension cords are not designed to carry heavy amperage demanded of permanent
wiring. Excess loads may cause overheating and fire.
Computer workstations can require outlets for more than two devices from a
single dual receptacle wall circuit. Older CRT monitors and laser printers can
cause surges when they are turned on. The best solution is to supply the
required outlets on separate circuit(s) designed to exceed the demand. The next
best option is to use a fused and surge protected uninterrupted power supply
(UPS) to protect your equipment. UPS are now available for less than $100 and
can protect your computer investment from power problems better than anything
else. The less expensive power bars and extension cords run risks of equipment
damage or fires if the circuit is overloaded.
4. Inadequate feeder lines
Older houses may have original two-wire feed lines from the power company’s
nearest utility pole. One of the wires is hot, delivering 110-115 volts and the
other is neutral. Obviously these lines will not power 240 volt appliances nor
is the amperage likely able to power more than a few newer appliances at a time.
The electric company should replace the two wire system with a three wire system
at their own expense. Since you will have to pay an electrician to install a new
service panel, use your circuit map and any expansion plans to determine future
demand, then size the new panel capacity accordingly.
5. Overtaxed transformer
In older high-density neighborhoods electricity demands over time have
increased. In some cases the transformer serving the area may not have been
increased to meet the growth in demand. Although the power companies are
required to scale up supply according to demand, it is wise to check into the
matter before paying to connect a larger service.
About the Author:
Brian Hack currently authors and publishes Habitat for Health eco-biz connectrix,
a web site of consumer information about how to make healthier choices in home
improvement, home decor, and home business, extended at http://www.h4h.biz.
Please visit
http://www.habitatforhealth.ca/articles/electric.html
for links supporting the content of this article.
If you are looking for a professional electrician, please call us today at 877-240-VOLT or complete our online request form.
|
